Full Idea
Nature uses the infinite in everything it does.
Gist of Idea
Nature uses the infinite everywhere
Source
Gottfried Leibniz (works [1690]), quoted by Philip Kitcher - The Nature of Mathematical Knowledge 10.1
Book Reference
Kitcher,Philip: 'The Nature of Mathematical Knowledge' [OUP 1984], p.236
A Reaction
[The quote can be tracked through Kitcher's footnote] He seems to have had in mind the infinitely small.